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<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
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<body>
    <button id="connect">连接</button>
    <button id="send" disabled='true'>发送</button> <br/> 从服务器接收的数据如下： <br/>
    <span id="recv"></span>

    <script>
        var connect = document.querySelector('#connect')
        var send = document.querySelector('#send')
        var recv = document.querySelector('#recv')
        let ws = null
        connect.onclick = function() {
            ws = new WebSocket('ws://localhost:9998')
            ws.onopen = () => {
                console.log('连接服务器成功')
                send.disabled = false
            }
            ws.onclose = () => {
                console.log('连接服务器失败')
                send.disabled = true
            }
            ws.onmessage = msg => {
                console.log('接收到服务器发送的数据了')
                console.log(msg)
                recv.innerHTML = msg.data
            }
        }
        send.onclick = function() {
            ws.send(JSON.stringify({
                action: 'fullScreen',
                socketType: 'fullScreen',
                chartName: 'trend',
                value: 'chalk'
            }))
            console.log()
        }
    </script>
</body>

</html>